ok so i just pulled up a couple codes of my car becuase its cel light was on this is that i got.. P1151 Lack of H02S-21 switch, sensor indicates lean and P1131 lack of H02s-11 switch, sensor indicates lean... I havn't touched my O2 sensors all i have done is hit them as with my bolts with some PB blaster to make them easy to get off... what could be causing this?? and for both of them to read this?? what gives??